package cn.trs.common.utils;

import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipFile;

import java.io.*;
import java.util.Enumeration;
import java.util.zip.ZipOutputStream;

/**
 * @version 1.0
 * @author:TRS
 * @create:2023/2/23 9:59
 * @description:
 * @ClassName: ZipUtil
 * @company TRS
 */
public class ZipUtil {
    private static final int buffer = 2048;

    /**
     * 解压Zip文件
     *
     * @param path 文件目录
     */
    public static void unZip(String path) {
        int count = -1;
        String savepath = "";

        File file = null;
        InputStream is = null;
        FileOutputStream fos = null;
        BufferedOutputStream bos = null;
        //保存解压文件目录
        savepath = path.substring(0, path.lastIndexOf(".")) + File.separator;
        new File(savepath).mkdirs();
        ZipFile zipFile = null;
        try {
            //解决中文乱码问题
            zipFile = new ZipFile(path, "gbk");
            Enumeration<?> entries = zipFile.getEntries();

            while (entries.hasMoreElements()) {
                byte buf[] = new byte[buffer];

                ZipEntry entry = (ZipEntry) entries.nextElement();

                String filename = entry.getName();
                boolean ismkdir = false;
                //检查此文件是否带有文件夹
                if (filename.lastIndexOf("/") != -1) {
                    ismkdir = true;
                }
                filename = savepath + filename;

                //如果是文件夹先创建
                if (entry.isDirectory()) {
                    file = new File(filename);
                    file.mkdirs();
                    continue;
                }
                file = new File(filename);
                //如果是目录先创建
                if (!file.exists()) {
                    if (ismkdir) {
                        //目录先创建
                        new File(filename.substring(0, filename.lastIndexOf("/"))).mkdirs();
                    }
                }
                file.createNewFile(); //创建文件

                is = zipFile.getInputStream(entry);
                fos = new FileOutputStream(file);
                bos = new BufferedOutputStream(fos, buffer);

                while ((count = is.read(buf)) > -1) {
                    bos.write(buf, 0, count);
                }
                bos.flush();
                bos.close();
                fos.close();

                is.close();
            }

            zipFile.close();

        } catch (IOException ioe) {
            ioe.printStackTrace();
        } finally {
            try {
                if (bos != null) {
                    bos.close();
                }
                if (fos != null) {
                    fos.close();
                }
                if (is != null) {
                    is.close();
                }
                if (zipFile != null) {
                    zipFile.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 压缩文件
     *
     * @param path   根目录，压缩的时候排除根目录
     * @param topath 压缩到的目标文件
     * @throws FileNotFoundException
     */
    public static void zip(String path, String topath) throws FileNotFoundException {
        File file = new File(path);
        zip(file.listFiles(), topath);
    }

    /**
     * 压缩多个文件
     *
     * @param files  多个文件数组
     * @param topath 压缩到的目标文件
     * @throws FileNotFoundException
     */
    public static void zip(File[] files, String topath) throws FileNotFoundException {
        FileOutputStream fos1 = new FileOutputStream(new File(topath));
        toZip(files, fos1);
    }

    /**
     * 压缩一个目录带多个文件
     *
     * @param files  多个文件数组
     * @param topath 压缩到的目标文件
     * @throws FileNotFoundException
     */
    public static void zip(File fileDir, String topath) throws FileNotFoundException {
        FileOutputStream fos1 = new FileOutputStream(new File(topath));
        File[] files = new File[1];
        files[0]=fileDir;
        toZip(files, fos1);
    }

    /**
     * 压缩成ZIP 方法1
     *
     * @param srcDir           压缩文件夹路径
     * @param out              压缩文件输出流
     * @param KeepDirStructure 是否保留原来的目录结构,true:保留目录结构;
     *                         false:所有文件跑到压缩包根目录下(注意：不保留目录结构可能会出现同名文件,会压缩失败)
     * @throws RuntimeException 压缩失败会抛出运行时异常
     */
    private static void toZip(String srcDir, OutputStream out, boolean KeepDirStructure)
            throws RuntimeException {

        long start = System.currentTimeMillis();
        ZipOutputStream zos = null;
        try {
            zos = new ZipOutputStream(out);
            File sourceFile = new File(srcDir);
            compress(sourceFile, zos, sourceFile.getName(), KeepDirStructure);
            long end = System.currentTimeMillis();
            System.out.println("压缩完成，耗时：" + (end - start) + " ms");
        } catch (Exception e) {
            throw new RuntimeException("zip error from ZipUtils", e);
        } finally {
            if (zos != null) {
                try {
                    zos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }

    /**
     * 递归压缩方法
     *
     * @param sourceFile       源文件
     * @param zos              zip输出流
     * @param name             压缩后的名称
     * @param KeepDirStructure 是否保留原来的目录结构,true:保留目录结构;
     *                         false:所有文件跑到压缩包根目录下(注意：不保留目录结构可能会出现同名文件,会压缩失败)
     * @throws Exception
     */
    private static void compress(File sourceFile, ZipOutputStream zos, String name,
                                 boolean KeepDirStructure) throws Exception {
        byte[] buf = new byte[buffer];
        if (sourceFile.isFile()) {
            // 向zip输出流中添加一个zip实体，构造器中name为zip实体的文件的名字
            zos.putNextEntry(new ZipEntry(name));
            // copy文件到zip输出流中
            int len;
            FileInputStream in = new FileInputStream(sourceFile);
            while ((len = in.read(buf)) != -1) {
                zos.write(buf, 0, len);
            }
            // Complete the entry
            zos.closeEntry();
            in.close();
        } else {
            File[] listFiles = sourceFile.listFiles();
            if (listFiles == null || listFiles.length == 0) {
                // 需要保留原来的文件结构时,需要对空文件夹进行处理
                if (KeepDirStructure) {
                    // 空文件夹的处理
                    zos.putNextEntry(new ZipEntry(name + "/"));
                    // 没有文件，不需要文件的copy
                    zos.closeEntry();
                }

            } else {
                for (File file : listFiles) {
                    // 判断是否需要保留原来的文件结构
                    if (KeepDirStructure) {
                        // 注意：file.getName()前面需要带上父文件夹的名字加一斜杠,
                        // 不然最后压缩包中就不能保留原来的文件结构,即：所有文件都跑到压缩包根目录下了
                        compress(file, zos, name + "/" + file.getName(), KeepDirStructure);
                    } else {
                        compress(file, zos, file.getName(), KeepDirStructure);
                    }

                }
            }
        }
    }

    /**
     * 压缩成ZIP 方法2
     *
     * @param srcFiles 需要压缩的文件列表
     * @param out      压缩文件输出流
     * @throws RuntimeException 压缩失败会抛出运行时异常
     */
    private static void toZip(File[] srcFiles, OutputStream out) throws RuntimeException {
        long start = System.currentTimeMillis();
        ZipOutputStream zos = null;
        try {
            zos = new ZipOutputStream(out);
            for (File srcFile : srcFiles) {
                if (srcFile.isFile()) {
                    byte[] buf = new byte[buffer];
                    zos.putNextEntry(new ZipEntry(srcFile.getName()));
                    int len;
                    FileInputStream in = new FileInputStream(srcFile);
                    while ((len = in.read(buf)) != -1) {
                        zos.write(buf, 0, len);
                    }
                    zos.closeEntry();
                    in.close();
                } else {
                    compress(srcFile, zos, srcFile.getName(), true);
                }
            }
            long end = System.currentTimeMillis();
            System.out.println("压缩完成，耗时：" + (end - start) + " ms");
        } catch (Exception e) {
            throw new RuntimeException("zip error from ZipUtils", e);
        } finally {
            if (zos != null) {
                try {
                    zos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    public static void main(String[] args) throws Exception {
        //zip("D://test/testcoursewareid", "D://test/testcoursewareid.zip");
        //File fileDir = new File("D://test");
        //System.out.println(fileDir.getAbsolutePath());
    	/*FileOutputStream fos1 = new FileOutputStream(new File("D://test/courseware/sfasdfasfasfd.zip"));
    	File fileDir = new File("D://test/courseware/sfasdfasfasfd");
    	toZip(fileDir.listFiles(), fos1);*/
        //unZip("D:/test/test20190215.zip");
        String zipUrl = "http://txos.staff.xdf.cn/iteach/game/9afb9301991d4293ae2a1e1cf164f1e4.zip";
        String zipName = zipUrl.substring(zipUrl.lastIndexOf("/")+1,zipUrl.length());
        System.out.println(zipName);
    }
}
